No.l3r>o. NATURAL HISTORY OF THE ISOPODA— RICHARDSON. 49 



antenna' (Miors writes'^' that there are from twelve to fourteen joints 

 in the llaiielhuii of the second pair of anteniue in C {Idofia) Jouijicun- 

 dati(s)\ in the much shorter second pair of antennjc; in having the 

 ])ody eveidy convex, while in C. lonfficdudatiis '*the dorsal surface of 

 the thoracic seo-ments is nearly flat, while the margins with the epi- 

 inera stand nearly perpendicular to them;" in having the first thoracic 

 segment much shorter than the four following segments, which are 

 about equal in length, while in C. longicnuddtus the first segment is 

 equal in length to the two following segments; in having the head 

 broader than long, Avhile the reverse is true of C. longlcaudatns^ and in 

 the more tapering terminal abdominal segment, the sides being moi-e 

 nearly parallel from the base to about the middle of the segment in 

 C. longicaudatus. 



This genus differs from all the other known genera of IdoteidtB except 

 GhjjAldotea Stebbing* and Crahyzox in having the maxillipeds with a 

 five-jointed palp. It is in agreement with Glyptldotea in having the 

 epimera of all the thoracic segments, from the second to the seventh 

 inclusive, distinct from the segments, and in having a uniarticulate 

 abdomen. It differs, however, from Stebbing's genus in not having 

 sculptured joints to both pairs of antenna?, and in not having the legs 

 more or less subchelate in character. The abdomen of Glyptldotea 

 has not the lateral rudiments of several coalesced segments. 



The genus Crahyzox was formerly included in Idotea by Miers in nis 

 subdivision of the genus corresponding to Stenosoma Leach. The max- 

 illipeds of Stenoaonia. have, however, four-jointed palps as in Tdotea 

 Fabricius,^ w^hile in Crahyzox they have five-jointed palps (Stebbing). 



ONISCOIDEA. 

 Family LIGIID^. 



LIGIA EXOTICA Roux. 



Light r.mfira'Rovx, Crufst. Medit. , 1S28, p. 8, pi. xiii, fig. 9. 



Ligia gdndichaudil Milne Edwards, Hist. Nat. des Crust., Ill, p. 157. — Dana, 



Expl. Exp., p. 741, pi. xLix, figs. 6a-h. — Nicolet in Gay, Hist. Cliik-, IIJ 



1849, p. 265. 

 Ligia exotica Bcdde-Lund, Crust. Isop. Terrestria, 18S5, j>p. 2t)()-2(j8. 



Locality. — Tokyo. Japan. (Collected by Jordan and Snyder.) 

 Misaki, Sagami, Japan. (Collected b}'^ Jordan and Snyder.) 



f'Journ. Linn. 8oc. London, XVI, 1883, p. (18. 



''Cape of Good Hope, I)ei)t. of Agriculture: Marine Investigations in Simtli Africa, 

 No. 12, 1901, pp. 50-59. 



<'The information in reganl to tiie number of joints to tiie ]>ali> ni the maxillipeds 

 in Sd'no.soiiia was kindly furnished me by Kev. T. K. R. Stebbing. 



Froc. N. M. vol. xxvii— 03 4 



